એક વિદ્યુત્ત દ્વિધ્રુવીને \(1000 \,V/m\) વિદ્યુત્તક્ષેત્ર \(45^o\) ના ખુણે આપવામાં આવે છે. વિદ્યુત દ્વિધ્રુવી ચાકમાત્રા \(10^{-29}\,C.m\) છે. આપવામાં આવેલ વિદ્યુતક્ષેત્રની અસર હેઠળ વિદ્યુત દ્વિધ્રુવી ની સ્થિતિઉર્જા કેટલી હશે?

A \( - 20 \times {10^{18}}\,J\)
B \( - 7 \times {10^{-27}}\,J\)
C \( - 10 \times {10^{-29}}\,J\)
D \( - 9 \times {10^{-20}}\,J\)

Verified Solution

Answer & Solution

Correct Answer

(B) \( - 7 \times {10^{-27}}\,J\)

Step-by-step Solution

Detailed explanation

\(U = - \vec P \cdot \vec E\) \( = - PE\cos \theta \) \( = - \left( {{{10}^{ - 29}}} \right)\left( {{{10}^3}} \right)\cos {45^\circ }\) \( = - 0.707 \times {10^{ - 26}}\,{\text{J}}\) \( = - 7 \times {10^{ - 27}}\,{\text{J}}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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